Direct answer
Closed-cell foam: rarely. Open-cell foam: occasionally for nesting material, not as a path. We fill all penetrations with closed-cell during install, which most pests find impassable. Crucial for attic installs.
Authoritative sources
- US Department of Energy ↗
DOE Energy Saver guide to insulation types, R-values, and recommended applications.
- IRS Section 25C ↗
Energy Efficient Home Improvement Credit, up to $1,200/yr for qualifying insulation work.
- Energy Star ↗
Energy Star recommendations for attic and wall insulation R-values by climate zone.
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